A339945 Numbers y such that sqrt(6*y^2+10)-3 is prime.
3, 13, 31, 129, 29180479, 121378881, 110778874246369293, 263631110418336671, 95129083120198558843838970225921, 213007829848951141529011991896053267187
Offset: 1
Keywords
Examples
a(3) = 31 is a term because sqrt(6*31^2+10)-3 = 73 is prime.
Links
- Robert Israel, Table of n, a(n) for n = 1..15
Crossrefs
Cf. A339935.
Programs
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Maple
g:= gfun:-rectoproc({a(i+4)-10*a(i+2)+a(i)=0, a(0)=1, a(1)=3, a(2)=13, a(3)= 31},a(i),remember): select(y -> isprime(sqrt(6*y^2+10)-3), map(g, [$1..100]));
Comments